Probably flat but they did not really know. What matters is what made it into the Word which does not definitively say that the earth is flat. All the language associated with the flat earth concept can be remapped. Check out my post and discussion that follows here:
Job thought of it:
- Job 26:7 He stretcheth out the north over the empty place, and hangeth the earth upon nothing.
- North (6828. צָפוֹן tsaphon) Meaning: hidden, dark, the north as a, quarter
Usage: The Hebrew word “tsaphon” primarily denotes the direction “north.” It is used in the Bible to describe geographical orientation, often in relation to the land of Israel. In a broader sense, “tsaphon” can also symbolize mystery or hiddenness, drawing from its root meaning.
Cultural and Historical Background: In ancient Near Eastern cultures, cardinal directions held significant symbolic meanings. The north, or “tsaphon,” was often associated with mystery and the unknown, as it was the direction from which invading armies frequently came. In Israelite cosmology, the north was also linked to the abode of God, as seen in some poetic and prophetic texts.
Job could have said other directions as well, but chose north as its associated with the unknown. They got attacked from the north by didn’t know where the armies came from. They just didn’t know the extent of the earth, if it had an end, or what shape it was. The land extended to the unknown and stood over the ‘empty place’.
- Empty place (8414. תֹּהוּ tohu) Formlessness, emptiness, confusion, chaos, nothingness
Same word translated as ‘without form’ in Gen 1:2 used to describe the Great Deep. So we have the land stretching out to an unknown space standing over the deep. Shape is unknown and does not rule out the fact that it turns back on itself into a spherical shape. The Deep, the inner part of the earth is then contained and does not surround everything:

and these were all still surrounded by the Great Deep. They had no concept of even a possibility of a volume filled with nothing!
The earth hangs upon nothing.
- Nothing (1099. בְּלִימָה belimah) - Definition: Nothing, without, emptiness
Meaning: nothing whatever
Job does not say that the earth, as well as God in the heavens, are suspended in a fluid (Great Deep) that extends in all directions forever.